Thetford SC234200 automatic vent for use with cassette toilet holding tanks C234 and C200.
Thetford part number: 2372274
The Thetford automatic vent part consists of the following part numbers for the holding tank C234
19. A Automatic vent upper
19. B Seal automatic vent
19. C Foam
The same part is used in the C200 holding tank but listed as the following part numbers:
8. Seal automatic vent
9. Upper automatic vent
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